SPOILER ALERT:
I can't say I trust Bella, either.
Last night I was just sitting in bed imagining Breaking Dawn. Post-wedding. I imagined that right after the wedding, they left, Edward changed Bella, and then a couple days later, Bella was a vampire xD
That's what would happen in a perfect world. But it's not a perfect world :I
Jacob will probably show up to screw up the wedding at some point in time.